Inductance device.



L. ESPENSCHIED.

INDUCTANCE DEVICE. 0 OCT. 13, ms. RENEWED JUNE 14. I917- Patented J uly 17, 1917.

APPLlCATlON FlLE a phantom circuit threugh which talking- LLOYD nsrnnsonrsn, or BnooKLYn, new roan, assrenon .ro AMERICAN 'rntnrnonn Ann 'rnLneanrr-I oomranr, a CORPORATION or new roan;

rnnncrelten DEVICE.

Specification of Letters Patent.

Application filed October 13, 1915, Serial No. 55,716. Renewed June It, 1917. Seriallt'o,c1l7t,77t.

To all whom it may concern:

Be it known that I, LLOYD Esrn'nsonmn, residing at Brookl n, in the county of Kings, and State 0% New York, have invented certain Improvements in Inductance Devices, of which the following is a specification.

This invention relates to [devices for producmg various inductance effects, it being Figure 1 of the accompanying drawings shows the invention diagrammatically as applied to loading a duplex telephone circuit; and Figs. 2 and 3 illustrate, respectively, the paths followed by the flux due to the side circuit and phantom circuit cur rents in the core of the device shown in Fig. 1. I I p The characters A, B and C, D designate the line conductors of two physical telephone circuits in which talking current flows in series through both pairs of conductors, as indicated by the full and dashed arrows, respectively. By any suitable means these physical circuits are made to serve also as currentpas'ses in series through the pairs of conductors each joined in parallel, as the dotted arrows indicate. Included in the duplex circuit is an inductance device E adapted to produce its edeet, in the present instance a loading action, in each of the three component circuits. The device comprises a core of magnetic material having a rimary portion 10 in the form of a closed gure, preferably a toroid, though it is'to be understood that this term does not necessarily imply a body circular in cross sec tion. Upon this primary ortion is a sectional wmding for each 0 the conductors of the duplex circuit, the sections being separately designated as T1, .lLt', L", T),

L, L, L, L with the same small letter superscript indicating the sections ot the same line winding. Since it is desired to cause the windings to aect both the physical and phantom circuits, and since the c ose inductive coupling of the windings and consequent neutra'lizmg action for current for which the coil is not designed to act defeats.

, resulting from the windings of one side circuit through those of the other side circuit. These branches, in the embodiment of the invention now under consideration, are turnished by a second closed core portion 11, which is shown as toroidal and situated outside and concentric to the portion 10, though it may also consist of a continuous inclosin body or shell. To reduce the reluctance o the flux paths from the inner, or primary,

portion of the-core to the outer portion, 1n-

trmediate. connecting portions 12, 13, 1d and 15 are preferably provided, these extendingradially at points 90 apart about the peripheries of the inner and outer portions. he sections of the line windings occupy the quadrants of the portion 10 marked by the connecting portions, passing between this portion 10 and'th'e portion 11. The sections L and'L belonging to the conductor A are upon adjacent quadrants a and I), while the sections of the companion windingL and LP for conductor B are upon the oppositequadrants c and 01', they thus being 'on distinct divisions of the portion 10 at opposite sides of a horizontal line; The sections belonging to the conductors of the other physical circuit O, l) are similarly situated upon opposite sides of a vertical line, the two sets of line windings thus lying at 90 with respect to one another. Thus the sections of the difierent physical circuits overlie one another, 1L being upon the quadrant c with section L of conductor B, while If ison quadrant 0 with section L Sections L and IF are associated with It and L on quadrants and a l, respectively. To aid in balancing the windings, the sections for be same line conductor are at die'rent distances from the core, being one within and the other without the winding-section of the other circuit which shares the quadrants with them. The two sections of each 30 rants of both toroids.

any aiding for Side circuit current. The

7 sections of each side circuit pair of line windings are thus joined in,symmetr1cal groups, the two sectionsof each group having their inductances mutually aidin and the two groups as units having their inductances mutually opposing .-i:'or side circuit current For phantom circuit current, the

- core portion 10which are surrounded by winding sections of difierent conductors, as L, L and L L joined with their inductances aiding, then together through the connecting portions between the quadrants upon which are the winding sections of one conductor, as L, L there dividing and passing through opposite halves of the outer toroid and returning to the inner by way of the opposite connecting portion between the winding sections of the other conductor of the sameside circuit, as L'", L. The phantom current flux (Fig. 3) traverses four paths furnished by adjacent, connectingportions of the core and the intercepted quad- The ratio of the phantom to Side circuit inductance produced by this arrangement is approximately 0.5.

The mutual inductances which affect the electromagnetic balance between the circuits are those between line windings of different circuits. In order that the component circuits shall be balanced, and hence non-interfering in this respect, it is necessary that there be no resultant mutual inductance between thethree circuits, that is, that the four mutual inductances "between. the. four line windings. neutralize one another. To provide that the-effective mutual inductance between the circuits be zero, two of the four mutual inductances must balance the other two. In the arrangement described, the windings are so poled that two act oppositely to the other two for either the side circuit connection in both side circuits (the condition for zero side-to-side crosstalk) or for the side circuit connection in one circuit n i u o and the phantom clrcuit connection in the other circuit (the condition for zero phantom-to-side crosstalk). Moreover, the complete line Winding of one side circuit is arranged symmetrically upon the core with respect to each of the line windings of the other side circuit. For example, the sections L L' of conductor A have the same relation-to the sections L, U of conductor C that they have to sections L, L of con-.

ductor D. Each winding section presents an angular relation to the sections of the other sidecircuit as follows-one of zero balanced electrostatically and with respect to effective resistance and self inductance. In consequence of this, there will be theoretically no crosstalk between the several circuits of the loading unit.

The claims hereof are directed to branch magnetic circuit loading coils having inner and outer core portions with cooperating line windings and to the division of the windings into separate sections for such branch magnetic circuits. Other specific embodiments of the invention herein claimed are disclosed in Fig. 40f my copending application Serial No. 55,714, filed October 13, 1915, and in Fig. 2 of my copending application Serial No. 55,717, filed October 13, 1915.

The structure herein illustrated and described constitutes another embodiment of the genericinvention claimed in my said copending application Serial No. 55,714, and also constitutes another embodiment of the invention claimed in my said copending application Serial No. 55,717.

I claim:

1. A loading coil for use in duplex circuits including two metallic telephone lines, sa1d coil comprising inner and outer core portions each in the form of a closed figure, and

pairs of line windings cooperatingwith said core .portions, each pair being upon different parts of the core portions.

a 2. A loading coilfor use in duplex circuits including two metallic telephone lines, said coil comprising inner and outer core portions each in the form of a closed figure, pairs of line windings cooperating with said core portions, the pairs of windmgs being differently disposed in respect to said core portions, and the windings of diiferent pairs eing upon the same parts of the core portions.

3. A loading coilfor use in duplex circuits including two metallic telephone lines, said coil comprising inner and outer core portions each in the form of a closed figure, and pairs of line windings mounted on the inner core portion, said pairs being difi'erently disposed in respect to said core portions.

4. A loading coil for use in duplex circuits including two metallic telephone lines, said'coil comprising inner and outer core portions each in the form of a closed figure, pairs of line windings on the inner core portion, said pairs being differently di osed in respect to said core portions, an the windings of different pairs being upon the same core portions.

5'. A loading coil for use in duplex circuits including two metallic telephone lines,

weaves said coil comprising inner and outer core portions each in the form of a closed figure,

other core portions connecting saidcore portions, and a plurality of pairs of line windin s surrounding the inner corefportions, said pairs of windings being difierently dis posed in respect to said core portions.

6. A loading coil for du lex circuits including two metallic telep one lines, said coil comprising inner and outer core portions each in the form of a closed figure, other core portions connecting said closed core portions, and a pluralit of pairs of line windings surrounding t e inner core portions between the connectin portions, the windings of difi'erent pairs eing upon the same parts of the inner core portions.

7. A loading coil for use in duplex circuits including two metallic telephone lines, said coil complrising inner and outer core portions eac in the form of a closed figure, other core portions connecting said closed core portions, and a plurality of pairs of windings cooperating with said core portions, said pairs being difierently disposed in respect to said core portions.

8. A loading coil for use in duplex circuits including two metallic telephone lines, said coil comprising inner and outer core portions each in the form of a closed figure, other core portions connecting said closed core portions, a plurality of pairs of line windings coiiperating with said core portions, said pairs being difl'erently disposed in respect to said core portions, and the windings of diderent pairs being upon the same parts of the core portions.

9. An inductance device for use in duplex circuits comprising a magnetic core having a toroidal portion, two pairs of line windings each winding 'being in two sections, the sections of each winding being upon adjacent toroid quadrants with the sections of the companion line winding upon opposite toroid quadrants, and the sections of two pairs of line windings lying at 90 with respect to one another.

10. An inductance device for use in duplex circuits comprising a magnetic core having a portion forming a closed figure, and two pairs of line windings each winding being in two sections, the sections of each winding being on adjacent quadrants oi the closed portion of the core with the sections ot the companion line windings on opposite quadrants, and the sections of the two pairs of a line windings lying at right angles to one another.

ll. An inductance device for use in duplex circuits comprising a magnetic core having a toroidal portion, and two pairs of line windings each winding being in two sections, the sections of each winding being upon adjacent toroid quadrants with the sections of at the companion line winding upon opposite toroid quadrants,- and the sections of the two pairs of line windings lying at 90 with respect to one another upon the same toroidal portion.

12. An inductance device for use in duplex circuits comprising a magnetic core having a plurality of toroidal portions, and two pairs of line windings each winding being in two sections, the sections of each winding being upon adjacent toroid quadrants with the sections of the companion line winding upon opposite toroid quadrants, and the sections of the two pairs of line windings lying at 90 with respect to one another upon the same toroidal portion.

13. A loading coil for use in duplex circuits comprising a magnetic core having two toroidal portionsand intermediate portions connecting the toroidal portions and dividing them into quadrants, and two pairs of line windings each 'winding being in two sections, the sections of each windin being upon adjacent toroid quadrants with the sections of the companion line winding upon opposite toroid quadrants, and the sections of the two pairs of line windings lying at 90 with res. ect to one another.

14. A loa ing coil for use in duplex circuits including two metallic telephone lines, said coil comprising inner and outer core portions each in the form of a closed figure, and pairs of line windings coiiperating with said core portions, each: winding being in sections, said pairs being diderently disposed in respect to said core portions, and the sections of diderent pairs of windings being upon the same parts of the core sections.

15. An inductance device tor duplex circuits comprising a ma etie core having a primary winding portlon and branch portions, and line windings divided into sections, the sections of difi'erent line windings overlying one another upon the same core portion and being situated at dierent distances from the core.

16. Afloading coil for use in duplex circuits including two metallic telephone lines, said coil comprising inner and outer core portions each 111 the form of a closed figure, and pairs of line windings upon the inner 5 core portion, said pairs being diderently disposed in respect to said core portions, said windings being in sections and the sec. tions of diderent pairs of windings being upon the same parts of the core sections. 120

17. An inductance device for duplex circuits comprising a magnetic core having inner and outer portions, and line windings divided into sections, the sections of ditt'erent line winds one another 1% upon the same core portion.

18. An inductance device tor use in duplex circuits consisting ct 0 physical circuits and a phantom circuit comprisi core, and windin tor each ot the -15 tors of the physical circuits,

bemg divided into two of each line winding each winding sectlons, the sectlons being connected with their inductances mutually opposing and the 5 adjacent sections of the windings of different conductors of the same physical circult being connectedwith their inductances mutually aiding -for while winding sections 10 different physical circui side circuit current,

of the conductors of ts are connected with CHI-AS. G. Hnrs Jr. A. C. FANGA. 

